Which was the original source of atmospheric oxygen? Question 4 options: autotrophs cooling of Earth's crust formation of the oceans volcanoes

Why is there more producers than consumers in a healthy habitat?

If you live with a person who has HIV can you also get it?

Does everyone float, or can some people just not?

What is nessecary for a convection cell to be set up in a fluid? 1.) Thermal gradient and changes in density. 2.) Changes in density 3.) Thermal gradient

10. A protein enters a cell. The outside of the cell has a higher concentration of that protein than the inside of the cell. Did the protein enter through active transport or a passive transport process?

Sponges are made up off

The maxinmum numbers of individuals of a particular species that a partiticlar environment can support is its

What is the layer of the atmosphere 20 km above Earth's surface

An experiment was conducted to determine which type of fruit attracts the most fruit flies. Equal sized pieces of apple, pear, and banana were placed in separate containers at different areas around the school.

In the F2 generation of Mendel's crosses, A. all plants had the dominant trait. B. half of the plants had the dominant alleleC. all plants had both the dominant and recessive alleles. D. one in four plants had two alleles for the recessive trait.